Halloi‘m from south germany and this is my first post here!I‘m building my own home powerwall with Jehu‘s PCB boards.first it will be round 10kwh couse i have now only 980 new lg mg1 cells.here some pics of stand now!

Looks great and Sevrus und Grüss Dich from an Oberösterreicher in Maine USA.

Wolf

If 18 X 650 = 2200+mAh then we have power!
May all your Cells have an IR of 70mΩ or less
Last count as of 3/20/2019
Total Number of Cells 3619
Cells >80% of Capacity 2317
Cells <80% of Capacity 1265
Cells ≥2200mAh & ≥ 80% 1590
Google Drive for info https://drive.google.com/drive/folders/1...sp=sharing
Not your average Wolf

Looking good, make sure to keep your stacks under 10 boards if you can to minimize voltage drop across the brass terminals, or thread some bare copper wire through the XT-60 terminal holes and solder to each board. What BMS are you going to be using with this system?

(01-07-2019, 08:50 AM)karmi27 Wrote: a BMS i dont use! i take an aktive balancer!
under - and overvolt my pip‘s are controlling!!
i think that should work good!

Your pip's are controlling global under and over voltage not a single pack voltage, unless you have almost perfectly balanced packs or this balancer can handle a huge current while balancing, your packs will unbalance for sure, and nothing will stop charging or uncharging until the whole battery's voltage reaches the configured value.

I think a BMS is mandatory just for cutting if a single pack goes out of range.

Why should they go out of balance?!
My system is 14s70p and the balancer has over 1amp balance current! i only charge till 4.1v per cell and every pack will have the same voltage as the system voltage is!!
i think you have a litte thinking error!